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Home >> Oldsmobile >> 2004 >> Bravada AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1743 (Engine Control System - 5.3L - Introduction) >> Repair Instructions >> Engine Control Module (ECM) Replacement >> Installation Procedure
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Installation Procedure

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2005 Isuzu Ascender, 2005 GMC Envoy XUV, 2005 GMC Envoy XL, 2005 GMC Envoy, and 2005 Chevrolet TrailBlazer. However, it is still accessible from the selected car via links, so may be relevant.
  1. If the ECM/TCM bracket (1) was previously removed, install the ECM/TCM bracket (1) to the vehicle frame.
    2. Fig 1: ECM/TCM Bracket Retaining Bolts
    GM1521466Courtesy of GENERAL MOTORS CORP.
  2. Install the ECM/TCM bracket retaining bolts (2).
    3. NOTE: Refer to Fastener Notice in Cautions and Notices.
  3. Tighten the ECM/TCM bracket bolts.

    Tighten:  Tighten the bolts to 10 N.m (89 lb in).

    4. Fig 2: ECM/TCM Bracket
    GM1521468Courtesy of GENERAL MOTORS CORP.
  4. If the TCM was previously removed from the ECM/TCM bracket (2), install the TCM (1). Refer to Transmission Control Module (TCM) Replacement in Automatic Transmission - 4L60-E/4L65-E.
    5. Fig 3: Removing/Installing Engine Control Module (ECM) To/From Bracket
    GM1521503Courtesy of GENERAL MOTORS CORP.
  5. Insert the ECM (2) into the retaining slots of the ECM/TCM bracket (1).
    6. Fig 4: ECM Electrical Connectors
    GM1521502Courtesy of GENERAL MOTORS CORP.
  6. Secure the ECM (2) to the ECM/TCM mounting bracket ensuring the ECM retaining tabs (1) are fully engaged.
    7. Fig 5: ECM Electrical Connectors
    GM1521497Courtesy of GENERAL MOTORS CORP.
  7. Connect the ECM electrical connectors (2) to the ECM (1) if previously removed.
    8. Fig 6: ECM/TCM Cover & Bracket
    GM1521469Courtesy of GENERAL MOTORS CORP.
  8. Install the ECM/TCM cover (2) to the ECM/TCM bracket (1).
  9. Ensure the ECM/TCM cover retainers (2) are fully engaged with the ECM/TCM bracket (1).
  10. Connect the cooling fan electrical connector.
  11. Connect the negative battery cable. Refer to Battery Negative Cable Disconnect/Connect Procedure in Engine Electrical.
  12. If the ECM was replaced the replacement ECM must be programmed. Refer to Control Module References in Computer/Integrating Systems.
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